Phonograph.



N0-4 708,'58I. v

wlvPEISKER. Patented Sept, 9j, |902` PHonoGAPH;

(no Model.) Ppmm med me. 1901.)

iFICE WILHELM PEISKER, `OF BERLIN, GERMANY.

PHONOGRAPH.

SPECIFICATION forming part of Letters Patent No. 708,581, dated September 9, 1902.

. Application tiled January 9, 1901. Serial No. l12.620. (No model.)

To a/ZZ whom t may con/cern:

Be it known that I, WILHELM PEISKER, residing at Berlin, Germany, have invented Improvements Relating to Phonographs, of which the following is a specification.

The present invention refers to a diaphragmholderfor holdingand for guiding diaphragms in phonographs. As will be known, there are two kinds of said diaphragms-recordingdia phragms and reprodcoing-diaphragme. The

recording-diaphragm marks into the surface of the record-cylinder a regular spiral line and must, therefore, be prevented from making any lateral movements. The reproducing-diaphragm follows the spiral line marked down by the recording-diaphragm. As any lateral pressure 0r any mechanical iniinences might canse the reproducing-diaphragm to be lifted off of the spiral line, said reprodwing-diaphragm must be allowed to have free lateral play. Now the reproducing-diaphragm mnstmovefreely and unobstructedly, while the recording-diaphragm has to be held rmly in its position.` Consequently the apparatus described hereinafter is arranged in such a manner that the diaphragm which happens to be in use is held according to the purpose which it has--that is to say, reproducing-diaphragms are held in a loose position and, on the other hand, recording-dia phragms are held in a secured position.

In the accompanying drawings, Figure lis a front view of the invention with parts omitted. Fig. 2 is a plan View. Fig. 3 is a sectional view on line A B of Fig I. Fig. 4 is a plan view, partly in section.

In the drawings I have shown only enough of the ordinary apparatus as is necessary to a complete understanding of my invention.

In Fig. 1, a is the instrument-frame of a phonograph arranged in the usual manner on two guide-bars d and e, so that it can be moved.

The instrument-frame has the form of a bentframe supported within a bridge b. The bridge-b and the instrument-frame a constitute one combined part and support, by means of two pointed screws h h, Figs. 2 and 3, a block p. Said block p is provided with an axle or pivot 7o, upon which a lat rod g is supported, so that it can be moved vertically. Said rod or plate g can move horizontally, because the block p, carrying it, can swing on the pivots 7o. The plate g serves for holding in place the diaphragms. In order to limit the movements of the arm or plate and to allow it at times more play, a slotl is provided in said arm or plate g, through which a cam-rod fm extends. Said rod is elliptical in cross-section and when turned, as shown in Fig. 4E, it prevents lateral movement of the plate, while allowing free vertical movement. However, if the cam or locking rod m is given a quarter-turn then arm or plateg can have free lateral movement with the diaphragm. To insure the easy and convenient turning oi' the locking-rod m, it is provided with an arm u.. Two stops oc m, arranged on the frame a, serve to limit the movement of the arm, so that the locking-rod m can be brought speedily and without difficulty into the recording or into the reproducing position.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, isl. In combination, a pivoted arm for supporting the diaphragm, having a slot, and a revoluble locking-rod passing through said slot and flattened on its side, said rod being arranged' to limit the lateral movement of the pivoted arm, substantially as described.

2. A holding device for recording and speaking apparatus in phonographs comprising an arm g, and a locking-rod m on which the arm is guided, said rod being flattened laterally, substantially as described.

In Witness whereof I have hereunto set my hand in presence of two witnesses.

WILHELM PEISKER. Witnesses:

HENRY I-IASPER, WOLDEMAR HAUPT. 

